:root {
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --code-bg: #f8fafc;
  --accent: #059669;
  --accent-d: #047857;
  --hero: #0b1220;
  --hero-fg: #e2e8f0;
  --ok: #059669;
  --bad: #dc2626;
  --radius: 12px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--sans); color: var(--fg); background: var(--bg); line-height: 1.6; -webkit-font-smoothing: antialiased; }
.container { width: min(1040px, 92vw); margin: 0 auto; }
a { color: var(--accent-d); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; }
code { font-family: var(--mono); font-size: 0.875em; }
.accent { color: var(--accent); }
.muted { color: var(--muted); }

/* nav */
.nav { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0; background: rgba(255,255,255,0.85); backdrop-filter: blur(8px); border-bottom: 1px solid var(--border); }
.nav .container { display: flex; align-items: center; justify-content: space-between; width: min(1040px,92vw); }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--fg); letter-spacing: -0.02em; }
.brand:hover { text-decoration: none; }
.nav nav { display: flex; gap: 22px; align-items: center; }
.nav nav a { color: var(--muted); font-weight: 500; font-size: 0.95rem; }
.nav nav a:hover { color: var(--fg); text-decoration: none; }

/* hero */
.hero { background: radial-gradient(900px 400px at 80% -10%, #14532d33, transparent), var(--hero); color: var(--hero-fg); padding: 84px 0 72px; }
.hero h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); margin: 0 0 18px; color: #fff; }
.hero .lead { font-size: 1.2rem; color: #cbd5e1; max-width: 640px; margin: 0 0 28px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 36px; }
.btn { display: inline-block; padding: 11px 20px; border-radius: 10px; font-weight: 600; font-size: 0.97rem;
  border: 1px solid var(--border); background: #fff; color: var(--fg); cursor: pointer; transition: transform .04s ease; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-d); }
.btn.ghost { background: transparent; color: #fff; border-color: #ffffff33; }

/* code */
pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; overflow-x: auto; font-family: var(--mono); font-size: 0.85rem; line-height: 1.5; }
.hero pre { background: #0f1729; border-color: #1e293b; color: #cbd5e1; }
.hero pre .tok { color: #6ee7b7; }

/* sections */
section.block { padding: 64px 0; border-bottom: 1px solid var(--border); }
section.block h2 { font-size: 1.7rem; margin: 0 0 8px; }
section.block .sub { color: var(--muted); margin: 0 0 32px; font-size: 1.05rem; }

/* feature grid */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.card { border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; background: #fff; }
.card h3 { margin: 0 0 8px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.96rem; }
.card .ic { font-size: 1.4rem; margin-bottom: 10px; }

/* stat strip */
.stats { display: flex; flex-wrap: wrap; gap: 40px; }
.stat .n { font-size: 2rem; font-weight: 700; color: var(--accent); letter-spacing: -0.02em; }
.stat .l { color: var(--muted); font-size: 0.9rem; }

/* docs layout */
.doc { display: grid; grid-template-columns: 220px 1fr; gap: 48px; padding: 48px 0; align-items: start; }
.toc { position: sticky; top: 70px; font-size: 0.92rem; }
.toc a { display: block; padding: 4px 0; color: var(--muted); }
.toc a:hover { color: var(--fg); text-decoration: none; }
.toc .h { font-weight: 700; color: var(--fg); margin: 14px 0 4px; font-size: 0.8rem; text-transform: uppercase; letter-spacing: .05em; }
.prose h2 { font-size: 1.5rem; margin: 40px 0 10px; padding-top: 8px; }
.prose h3 { font-size: 1.12rem; margin: 26px 0 6px; }
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { color: #334155; }
.prose table { width: 100%; border-collapse: collapse; margin: 12px 0; font-size: 0.92rem; }
.prose th, .prose td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
.prose th { color: var(--muted); font-weight: 600; }
.pill { display: inline-block; font-family: var(--mono); font-size: 0.78rem; font-weight: 600; padding: 2px 8px; border-radius: 6px; }
.pill.get { background: #ecfdf5; color: #047857; }
.pill.post { background: #eff6ff; color: #1d4ed8; }
.endpoint { font-family: var(--mono); font-weight: 600; }

/* playground */
.pg { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; padding: 36px 0 64px; align-items: start; }
.panel { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.panel-h { padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--code-bg); font-weight: 600; font-size: 0.92rem; display: flex; justify-content: space-between; align-items: center; }
.panel-b { padding: 16px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 12px; }
label { font-size: 0.82rem; color: var(--muted); font-weight: 600; }
select, input[type=text] { font-family: var(--sans); font-size: 0.9rem; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; background: #fff; color: var(--fg); }
textarea { width: 100%; min-height: 280px; font-family: var(--mono); font-size: 0.82rem; line-height: 1.5; padding: 12px; border: 1px solid var(--border); border-radius: 8px; resize: vertical; color: var(--fg); }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg button { border: none; background: #fff; padding: 8px 14px; font-size: 0.86rem; font-weight: 600; cursor: pointer; color: var(--muted); }
.seg button.on { background: var(--accent); color: #fff; }
.out-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.out-table td { padding: 5px 8px; border-bottom: 1px solid var(--border); }
.out-table td:last-child { text-align: right; font-family: var(--mono); }
.out-table tr.total td { font-weight: 700; border-top: 2px solid var(--border); }
.out-table tr.mark td { color: var(--accent-d); font-weight: 700; }
.badge { font-size: 0.78rem; font-weight: 600; padding: 2px 8px; border-radius: 999px; }
.badge.ok { background: #ecfdf5; color: var(--ok); }
.badge.bad { background: #fef2f2; color: var(--bad); }
.empty { color: var(--muted); font-size: 0.9rem; padding: 24px 4px; }

/* footer */
footer { padding: 40px 0; color: var(--muted); font-size: 0.9rem; }
footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

@media (max-width: 820px) {
  .doc { grid-template-columns: 1fr; }
  .toc { position: static; }
  .pg { grid-template-columns: 1fr; }
}